document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=967615>Question 967615</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Simplify the expression by using a double-angle formula.\r<BR>\n" );
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document.write( "cos^2 (3pi/11) - sin^2 (3pi/11) \r<BR>\n" );
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document.write( "Please let me know if this is correct: I think this is an identity problem. \r<BR>\n" );
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document.write( "cos (2A) = cos^2 A - sin^2 A\r<BR>\n" );
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document.write( "would the expression simplify to: <BR>\n" );
document.write( "cos(2 (3pi/11))\r<BR>\n" );
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document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #591396 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=591396\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Simplify the expression by using a double-angle formula. <BR>\n" );
document.write( "cos^2 (3pi/11) - sin^2 (3pi/11) \r<BR>\n" );
document.write( "\n" );
document.write( "Please let me know if this is correct: I think this is an identity problem. <BR>\n" );
document.write( "cos (2A) = cos^2 A - sin^2 A <BR>\n" );
document.write( "would the expression simplify to: <BR>\n" );
document.write( "cos(2 (3pi/11)) =6pi/11<BR>\n" );
document.write( "you got it correct </SPAN>\n" );
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